/* Base and Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #f9fafb;
    --text-main: #111827;
    --text-muted: #6b7280;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
    color: var(--text-main);
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-main);
}

/* Hero Section */
.hero {
    padding: 6rem 0 4rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.05em;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-text {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.8;
}

/* Recent Posts */
.recent-posts {
    padding: 2rem 0 5rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.75rem;
    display: inline-block;
    color: var(--text-main);
}

.post-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
}

.post-date {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.post-title a:hover {
    color: var(--primary-color);
}

.post-excerpt {
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.read-more {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    display: inline-block;
}

.read-more:hover {
    color: var(--primary-hover);
}

/* Footer */
.footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 600px) {
    .nav {
        display: none; /* For simplicity on mobile, or implement a hamburger menu later */
    }
    
    .hero {
        padding: 4rem 0 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-text {
        font-size: 1rem;
    }
}